194938391 has 8 divisors (see below), whose sum is σ = 197395200. Its totient is φ = 192487680.

The previous prime is 194938357. The next prime is 194938427. The reversal of 194938391 is 193839491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 194938391 - 2⁶ = 194938327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194938321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130175 + ... + 131663.

It is an arithmetic number, because the mean of its divisors is an integer number (24674400).

Almost surely, 2^194938391 is an apocalyptic number.

194938391 is a deficient number, since it is larger than the sum of its proper divisors (2456809).

194938391 is a wasteful number, since it uses less digits than its factorization.

194938391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3049.

The product of its digits is 209952, while the sum is 47.

The square root of 194938391 is about 13962.0339134383. The cubic root of 194938391 is about 579.8279225947.

The spelling of 194938391 in words is "one hundred ninety-four million, nine hundred thirty-eight thousand, three hundred ninety-one".